add support for choose different aws region endpoint.
avoid error message when user do not need to sign the deb.
fix order of args in call to S3Object.delete
Merge pull request #5 from fanxu/master

Add support to choose different s3 region endpoint
Upped version
added 'verify' command to find and fix manifest problems
Merge pull request #6 from musicglue/travis

Add 'verify' command to identify and fix manifest issues